Implement update branch API (#32433)

Resolves #22526.

Builds upon #23061.

---------

Co-authored-by: sillyguodong <33891828+sillyguodong@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
(cherry picked from commit 01b1896bf5eacfd7f4f64d9ebb0ad165e3e60a5c)

Conflicts:
	routers/api/v1/api.go
  context conflict + s/PathParam/Params/
	templates/swagger/v1_json.tmpl
  make generate-swagger

modules/structs/repo.go

@@ -290,6 +290,16 @@ type CreateBranchRepoOption struct {
 	OldRefName string `json:"old_ref_name" binding:"GitRefName;MaxSize(100)"`
 }
 
+// UpdateBranchRepoOption options when updating a branch in a repository
+// swagger:model
+type UpdateBranchRepoOption struct {
+	// New branch name
+	//
+	// required: true
+	// unique: true
+	Name string `json:"name" binding:"Required;GitRefName;MaxSize(100)"`
+}
+
 // TransferRepoOption options when transfer a repository's ownership
 // swagger:model
 type TransferRepoOption struct {

routers/api/v1/api.go

@@ -1153,6 +1153,7 @@ func Routes() *web.Route {
 					m.Get("/*", repo.GetBranch)
 					m.Delete("/*", reqToken(), reqRepoWriter(unit.TypeCode), mustNotBeArchived, repo.DeleteBranch)
 					m.Post("", reqToken(), reqRepoWriter(unit.TypeCode), mustNotBeArchived, bind(api.CreateBranchRepoOption{}), context.EnforceQuotaAPI(quota_model.LimitSubjectSizeGitAll, context.QuotaTargetRepo), repo.CreateBranch)
+					m.Patch("/*", reqToken(), reqRepoWriter(unit.TypeCode), mustNotBeArchived, bind(api.UpdateBranchRepoOption{}), repo.UpdateBranch)
 				}, context.ReferencesGitRepo(), reqRepoReader(unit.TypeCode))
 				m.Group("/branch_protections", func() {
 					m.Get("", repo.ListBranchProtections)

routers/api/v1/repo/branch.go

@@ -393,6 +393,77 @@ func ListBranches(ctx *context.APIContext) {
 	ctx.JSON(http.StatusOK, apiBranches)
 }
 
+// UpdateBranch updates a repository's branch.
+func UpdateBranch(ctx *context.APIContext) {
+	// swagger:operation PATCH /repos/{owner}/{repo}/branches/{branch} repository repoUpdateBranch
+	// ---
+	// summary: Update a branch
+	// consumes:
+	// - application/json
+	// produces:
+	// - application/json
+	// parameters:
+	// - name: owner
+	//   in: path
+	//   description: owner of the repo
+	//   type: string
+	//   required: true
+	// - name: repo
+	//   in: path
+	//   description: name of the repo
+	//   type: string
+	//   required: true
+	// - name: branch
+	//   in: path
+	//   description: name of the branch
+	//   type: string
+	//   required: true
+	// - name: body
+	//   in: body
+	//   schema:
+	//     "$ref": "#/definitions/UpdateBranchRepoOption"
+	// responses:
+	//   "204":
+	//     "$ref": "#/responses/empty"
+	//   "403":
+	//     "$ref": "#/responses/forbidden"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
+
+	opt := web.GetForm(ctx).(*api.UpdateBranchRepoOption)
+
+	oldName := ctx.Params("*")
+	repo := ctx.Repo.Repository
+
+	if repo.IsEmpty {
+		ctx.Error(http.StatusNotFound, "", "Git Repository is empty.")
+		return
+	}
+
+	if repo.IsMirror {
+		ctx.Error(http.StatusForbidden, "", "Git Repository is a mirror.")
+		return
+	}
+
+	msg, err := repo_service.RenameBranch(ctx, repo, ctx.Doer, ctx.Repo.GitRepo, oldName, opt.Name)
+	if err != nil {
+		ctx.Error(http.StatusInternalServerError, "RenameBranch", err)
+		return
+	}
+	if msg == "target_exist" {
+		ctx.Error(http.StatusUnprocessableEntity, "", "Cannot rename a branch using the same name or rename to a branch that already exists.")
+		return
+	}
+	if msg == "from_not_exist" {
+		ctx.Error(http.StatusNotFound, "", "Branch doesn't exist.")
+		return
+	}
+
+	ctx.Status(http.StatusNoContent)
+}
+
 // GetBranchProtection gets a branch protection
 func GetBranchProtection(ctx *context.APIContext) {
 	// swagger:operation GET /repos/{owner}/{repo}/branch_protections/{name} repository repoGetBranchProtection

routers/api/v1/swagger/options.go

@@ -101,6 +101,8 @@ type swaggerParameterBodies struct {
 	// in:body
 	EditRepoOption api.EditRepoOption
 	// in:body
+	UpdateBranchRepoOption api.UpdateBranchRepoOption
+	// in:body
 	TransferRepoOption api.TransferRepoOption
 	// in:body
 	CreateForkOption api.CreateForkOption

templates/swagger/v1_json.tmpl

@@ -5806,6 +5806,63 @@
             "$ref": "#/responses/repoArchivedError"
           }
         }
+      },
+      "patch": {
+        "consumes": [
+          "application/json"
+        ],
+        "produces": [
+          "application/json"
+        ],
+        "tags": [
+          "repository"
+        ],
+        "summary": "Update a branch",
+        "operationId": "repoUpdateBranch",
+        "parameters": [
+          {
+            "type": "string",
+            "description": "owner of the repo",
+            "name": "owner",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "description": "name of the repo",
+            "name": "repo",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "description": "name of the branch",
+            "name": "branch",
+            "in": "path",
+            "required": true
+          },
+          {
+            "name": "body",
+            "in": "body",
+            "schema": {
+              "$ref": "#/definitions/UpdateBranchRepoOption"
+            }
+          }
+        ],
+        "responses": {
+          "204": {
+            "$ref": "#/responses/empty"
+          },
+          "403": {
+            "$ref": "#/responses/forbidden"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
+          }
+        }
       }
     },
     "/repos/{owner}/{repo}/collaborators": {
@@ -27288,6 +27345,22 @@
       },
       "x-go-package": "code.gitea.io/gitea/modules/structs"
     },
+    "UpdateBranchRepoOption": {
+      "description": "UpdateBranchRepoOption options when updating a branch in a repository",
+      "type": "object",
+      "required": [
+        "name"
+      ],
+      "properties": {
+        "name": {
+          "description": "New branch name",
+          "type": "string",
+          "uniqueItems": true,
+          "x-go-name": "Name"
+        }
+      },
+      "x-go-package": "code.gitea.io/gitea/modules/structs"
+    },
     "UpdateFileOptions": {
       "description": "UpdateFileOptions options for updating files\nNote: `author` and `committer` are optional (if only one is given, it will be used for the other, otherwise the authenticated user will be used)",
       "type": "object",

tests/integration/api_branch_test.go

@@ -5,6 +5,7 @@ package integration
 
 import (
 	"net/http"
+	"net/http/httptest"
 	"net/url"
 	"testing"
 
@@ -187,6 +188,37 @@ func testAPICreateBranch(t testing.TB, session *TestSession, user, repo, oldBran
 	return resp.Result().StatusCode == status
 }
 
+func TestAPIUpdateBranch(t *testing.T) {
+	onGiteaRun(t, func(t *testing.T, _ *url.URL) {
+		t.Run("UpdateBranchWithEmptyRepo", func(t *testing.T) {
+			testAPIUpdateBranch(t, "user10", "repo6", "master", "test", http.StatusNotFound)
+		})
+		t.Run("UpdateBranchWithSameBranchNames", func(t *testing.T) {
+			resp := testAPIUpdateBranch(t, "user2", "repo1", "master", "master", http.StatusUnprocessableEntity)
+			assert.Contains(t, resp.Body.String(), "Cannot rename a branch using the same name or rename to a branch that already exists.")
+		})
+		t.Run("UpdateBranchThatAlreadyExists", func(t *testing.T) {
+			resp := testAPIUpdateBranch(t, "user2", "repo1", "master", "branch2", http.StatusUnprocessableEntity)
+			assert.Contains(t, resp.Body.String(), "Cannot rename a branch using the same name or rename to a branch that already exists.")
+		})
+		t.Run("UpdateBranchWithNonExistentBranch", func(t *testing.T) {
+			resp := testAPIUpdateBranch(t, "user2", "repo1", "i-dont-exist", "new-branch-name", http.StatusNotFound)
+			assert.Contains(t, resp.Body.String(), "Branch doesn't exist.")
+		})
+		t.Run("RenameBranchNormalScenario", func(t *testing.T) {
+			testAPIUpdateBranch(t, "user2", "repo1", "branch2", "new-branch-name", http.StatusNoContent)
+		})
+	})
+}
+
+func testAPIUpdateBranch(t *testing.T, ownerName, repoName, from, to string, expectedHTTPStatus int) *httptest.ResponseRecorder {
+	token := getUserToken(t, ownerName, auth_model.AccessTokenScopeWriteRepository)
+	req := NewRequestWithJSON(t, "PATCH", "api/v1/repos/"+ownerName+"/"+repoName+"/branches/"+from, &api.UpdateBranchRepoOption{
+		Name: to,
+	}).AddTokenAuth(token)
+	return MakeRequest(t, req, expectedHTTPStatus)
+}
+
 func TestAPIBranchProtection(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()